Cherished goal once heading for Glastonbury early on? (6)

I believe the answer is:

grayle

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'cherished goal' is the definition.
'grayle' can be an answer for 'goal' (I have seen 'early goal' mean 'grayle' so perhaps 'goal' could also mean 'grayle'). I'm not sure about the 'cherished' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for grayle that I've seen is " early goal".)

I've seen this clue in The Times and The Sunday Times.

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